Addition, subtraction, multiplication and division: for example, 12+3*2-5= 13.

Multiply, subtract and add: for example, 3*8+4-3=25.

Multiplication and addition: for example, 3*6+5-3=20.

Subtraction, addition and multiplication: for example, 20-2+3*2=24.

Subtraction, multiplication and addition: for example, 20-2*6-3=5.

Addition and subtraction: for example, 30÷5-3+6=9.

Addition and subtraction: for example, 30÷6+ 12-4= 13.

Division, multiplication and addition: for example, 40÷4*3+2=32.

Main teaching objectives of the second volume of Grade Two:

Let students feel the truth of "multiply and divide first and then add and subtract" by solving problems.

Make students understand and master the operation sequence of two-level operation (without brackets) and use the operation sequence correctly to calculate.

Cultivate students' good habit of looking at the operation sequence first and then calculating, and improve students' operation ability.